Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

An ancient Egyptian obelisk is now used to commemorate fallen Italian soldiers.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

A sculpture serving as an homage to Pope John Paul II.

Its interior is adorned with some of the best examples of early Christian mosaics.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

An alchemist's “magic door” stands in the middle of a Roman park.

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

A freedman baker’s lavish tomb has a relief showing various stages of Roman bread making.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

Charles Dickens was not a fan of the ghastly wall dressings in this 6th century church.

This small Roman arch was transformed into a dwelling by the founder of the Trinitarian Order.

A fortified medieval basilica on the Caelian Hill preserves extraordinary frescoes and one of Rome's most beautiful hidden cloisters.

A rather vulgar example of the transition from Latin to the Italian vernacular.

A Nesting Doll of Churches.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

This small church was constructed over the ruins of three temples dating to the Roman Republic.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

A 15th-century monumental Latin inscription on this house celebrates Lorenzo Manilio's love for Rome.

This is the oldest Roman-made bridge in the city still existing in its original state.

Everything from fried brains to stewed lungs are on the menu at this nose-to-tail spot.

Remnants of a 4th-century church with vivid medieval frescoes and ancient sarcophagi hide beneath this old basilica.

The mystic whose incorrupt corpse still attracts the faithful.